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Ultra large support roller forgings are prone to ultrasonic testing failure due to incomplete forging and compaction of the core. This time, the composite forging main deformation process of "upsetting WHF method for elongation+upsetting FM method for elongation" is adopted to achieve forging looseness and porosity, improve stress and inclusion distribution in the core of the steel ingot, and prevent the formation of new crack sources.

GH4169 alloy is a solid solution aging strengthened nickel based deformation high-temperature alloy with γ 'and γ' 'as the main strengthening phases. This alloy has multiple types of elements, high degree of alloying, and good comprehensive properties such as high strength and good plasticity.

The fracture of the 9Cr2Mo steel cold rolling roll is classified as hydrogen embrittlement fracture, with the crack initiation site located at the circular spots inside the roll where hydrogen accumulates. High hydrogen content and large quenching stress caused by delayed tempering are the main causes of hydrogen embrittlement fracture of the roll, while severe dendrite segregation and abundant inclusions accelerate the fracture. The recommendations are as follows:① Improve metallurgical quality to reduce the content of inclusions and the degree of segregation in the steel;② Increase the forging ratio to avoid dendrite segregation in the material;③ Prolong the hydrogen diffusion time to reduce the hydrogen content of the roll;④ Conduct tempering in a timely manner to reduce the quenching stress of the cold rolling roll.

When inspecting the quality of a 22Cr duplex stainless steel forging flange, it was found that some forgings had particularly poor toughness. Analysis of the reasons revealed that the fundamental reason for the decrease in toughness of the 22Cr duplex stainless steel flange was the formation of intermetallic precipitates in its microstructure. When the intermetallic precipitates reach a certain level, the toughness of the material will significantly decrease.

Comparison results of hardness, microstructure, and room temperature transverse mechanical properties were obtained through three different quenching processes during the actual quenching and tempering of 500mm forged large round bars. The final decision was made to use water air alternating cooling as the optimal quenching cooling process, and the overall hardness deviation of the steel after one tempering was ≤ 2.5HRC. The core tissue is composed of uniformly tempered martensite and a small amount of residual austenite, and the transverse tensile performance of the steel core at room temperature is the highest. During quenching, alternating water air cooling is used, resulting in the shortest total quenching time and highest production efficiency. As a quenching medium, water has the advantages of low price, no pollution, and stable performance, making it the preferred quenching cooling medium for quenching and tempering plants.

Stainless steel forging has long been recognized as a critical process in producing high-quality industrial components, especially where strength, corrosion resistance, and dimensional precision are paramount. Among the various stainless steel grades, SUS316L stands out due to its superior corrosion resistance and excellent mechanical properties. When forged into tube sheets, SUS316L stainless steel offers unmatched performance in demanding industrial environments such as power plants, chemical processing, and marine applications.